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Ivan Terentyevich Kleymyonov (Russian: Иван Терентьевич Клеймёнов; Staraya Surava, Tambov Governorate), last name also spelled Kleymenov; April 13, 1898 - January 10, 1938, was a Soviet scientist and one of the founders of Soviet rocketry.
In 1937, during Stalin's "Great Purge," he was arrested on unknown grounds, sentenced to death and executed based on false confessions coerced from others, including Georgy Langemak. In 1955, he was rehabilitated "due to the lack of a criminal matter" and awarded Hero of Socialist Labor (1991).
- Biography of Kleymyonov (in Russian)